Iniziamo a usare MySQL Workbench
E lo script di creazione
SET @[email protected]@UNIQUE_CHECKS, UNIQUE_CHECKS=0;
SET @[email protected]@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0;
SET @[email protected]@SQL_MODE, SQL_MODE='TRADITIONAL';
CREATE SCHEMA IF NOT EXISTS `chats` DEFAULT CHARACTER SET utf8 COLLATE default collation ;
-- -----------------------------------------------------
-- Table `chats`.`chat`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `chats`.`chat` (
`id` INT UNSIGNED NOT NULL AUTO_INCREMENT ,
PRIMARY KEY (`id`) )
ENGINE = InnoDB;
-- -----------------------------------------------------
-- Table `chats`.`chat_user`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `chats`.`chat_user` (
`id` INT UNSIGNED NOT NULL AUTO_INCREMENT ,
`handle` VARCHAR(45) NOT NULL ,
PRIMARY KEY (`id`) )
ENGINE = InnoDB;
-- -----------------------------------------------------
-- Table `chats`.`chat_line`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `chats`.`chat_line` (
`id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT ,
`chat_id` INT UNSIGNED NOT NULL ,
`user_id` INT UNSIGNED NOT NULL ,
`line_text` TEXT NOT NULL ,
`created_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ,
PRIMARY KEY (`id`) ,
INDEX `fk_chat_line_chat` (`chat_id` ASC) ,
INDEX `fk_chat_line_chat_user1` (`user_id` ASC) ,
CONSTRAINT `fk_chat_line_chat`
FOREIGN KEY (`chat_id` )
REFERENCES `chats`.`chat` (`id` )
ON DELETE NO ACTION
ON UPDATE NO ACTION,
CONSTRAINT `fk_chat_line_chat_user1`
FOREIGN KEY (`user_id` )
REFERENCES `chats`.`chat_user` (`id` )
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;
SET [email protected]_SQL_MODE;
SET [email protected]_FOREIGN_KEY_CHECKS;
SET [email protected]_UNIQUE_CHECKS;
E puoi scaricare il file MWB da la mia casella personale .
